Where condition to test for null

Hi,
I have a query where we were thinking that 2 fields will not have null values even though column allows nulls. So, wrote a query like this:
select.......
From table 1 left outer join table2 on (table1.name = 'I' and table2.accountnum in (table1.creditact, table1.debitact).
Now I need to check for null if table1.creditact and table1.debitact. If both fields are null, then I have to use third column to check because out of 3 column (creditact, debitact, act) one must have account number. How can I do it.
Thanks,
Spunny

I have a query where we were thinking that 2 fields [sic: columns are not fields] will not have NULL values [sic: NULL is not a value] even though column allows NULLs. So, wrote a query like this:
Please post DDL, so that people do not have to guess what the keys, constraints, Declarative Referential Integrity, data types, etc. in your schema are. Learn how to follow ISO-11179 data element naming conventions and formatting rules. Temporal data should
use ISO-8601 formats. Code should be in Standard SQL as much as possible and not local dialect.
This is minimal polite behavior on SQL forums. What you did post implies that your design is wrong. Did you actually have debits and credits as separate attributes in RDBMS? No, surely not! I will guess, based 30+ years of SQL, that you have a crappy design
with too many NULLs.
Would you like to obey the Netiquette so we can actually help you, or you do just want a Kludge?
--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
in Sets / Trees and Hierarchies in SQL

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